AGENT FOR PREVENTING DEPOSITION OF SCALE IN PRODUCTION OF VINYL CHLORIDE POLYMER AND PREVENTION PROCESS

Title:

AGENT FOR PREVENTING DEPOSITION OF SCALE IN PRODUCTION OF VINYL CHLORIDE POLYMER AND PREVENTION PROCESS

Document Type and Number:

Japanese Patent JPH04154804

Kind Code:

A

Abstract:

PURPOSE:To provide the subject preventing agent containing a xanthone-type natural pigment and a PVA having a specific saponification degree and giving a colorless polymer having high whiteness only a little forming fish-eye. CONSTITUTION:The objective preventing agent contains (A) a xanthone-type natural pigment (e.g. gentisin, swertiamarin, euxanthone, jacareubin, mangostin and mangiferin) and (B) a PVA having a saponification degree of >=70mol% (preferably >=98mol%) at a weight ratio (A:B) of preferably 100:(1-1,000). Deposition of scale can be prevented by applying the coating film containing the preventing agent to at least a part of the monomer-contacting part of a polymerizer in the polymerization of a vinyl chloride monomer.

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Inventors:

WATANABE MIKIO
UENO SUSUMU
USU MASAHIRO
NAKANO NORIHIKO

Application Number:

JP28126790A

Publication Date:

May 27, 1992

Filing Date:

October 19, 1990

Export Citation:

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Assignee:

SHINETSU CHEMICAL CO

International Classes:

C08F14/06; C08F2/00; C08F14/00; (IPC1-7): C08F2/00; C08F14/06

Attorney, Agent or Firm:

Yoshio Komiya

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